Bulbophyllum macranthum

Bulbophyllum macranthum is a species native to Southeast Asia, occurring in forested areas of Thailand, Laos, and neighbouring regions. It is notable for producing some of the larger flowers in the genus, reaching up to 10 cm across. The flowers are typically creamy white to yellow, often with purple spots or streaks, and display elongated sepals that spread outward. Like many Bulbophyllum, it is adapted for fly pollination, the flowers sometimes emitting a musky scent to attract insects. The plant itself has small pseudobulbs on a creeping rhizome, each bearing a single leaf, and is of interest to collectors for its unusual floral size and form.

Distinctive Features

• Pseudobulbs: Ovoid pseudobulbs, spaced along a rhizome, that are typically 3-5cm long (approximately 1.25-2 inches). Each pseudobulb produces a single leaf.
• Leaves: Leathery, dark green leaves that are typically 10-20cm long (approximately 4-8 inches).
• Flowers: Produces a single, large flower from the base of the pseudobulb. The flowers are typically 8-12cm in diameter (approximately 3-5 inches) and have a striking yellow-green colour with prominent red-purple markings. They often have a spicy fragrance.
• Growth Habit: This Bulbophyllum has a sympodial growth habit, meaning it grows laterally along a rhizome. It is an epiphyte, which means it naturally grows on trees and other surfaces, absorbing moisture and nutrients from the air and rain.

Care Tips

• Light: Bright, indirect light is best. Avoid harsh direct sunlight, which can scorch the leaves. An east-facing windowsill is often ideal.
• Water: Water regularly, allowing the potting mix to dry slightly between waterings. Avoid overwatering, which can lead to root rot.
• Humidity: This Bulbophyllum appreciates moderate to high humidity. You can increase humidity by using a humidifier, placing the plant on a pebble tray filled with water, or misting the leaves regularly.
• Temperature: Maintain intermediate to warm temperatures between 18-29°C (65-85°F) for optimal growth. Avoid exposing this tropical orchid to cold draughts or frost.
• Fertiliser: Use a balanced orchid fertiliser at half strength every two weeks during the growing season (spring and summer).
• Potting: This orchid can be grown in pots or mounted on cork bark or tree fern. Use a well-draining orchid potting mix that provides good air circulation around the roots.